#!/bin/ruby

n = gets.strip.to_i
a = gets.strip
a = a.split(' ').map(&:to_i)
# your code goes here
a.sort!
min_distance = a.last - a.first
#                                 puts min_distance
for i in (1..n-1)
    dist = a[i] - a[i-1]
    min_distance = dist if dist < min_distance
end
puts min_distance